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PCI: endpoint: Add dynamic_inbound_mapping EPC feature

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Introduce a new EPC feature bit (dynamic_inbound_mapping) that indicates
whether an Endpoint Controller can update the inbound address
translation for a BAR without requiring the EPF driver to clear/reset
the BAR first.

Endpoint Function drivers (e.g. vNTB) can use this information to decide
whether it really is safe to call pci_epc_set_bar() multiple times to
update inbound mappings for the BAR.

Suggested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260124145012.2794108-2-den@valinux.co.jp
This commit is contained in:
Koichiro Den 2026-01-24 23:50:05 +09:00 committed by Manivannan Sadhasivam
parent 0ecd890e3c
commit 06a81c5940
1 changed files with 5 additions and 0 deletions
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5
include/linux/pci-epc.h
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@ -223,6 +223,10 @@ struct pci_epc_bar_desc {
/**
* struct pci_epc_features - features supported by a EPC device per function
* @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
* @dynamic_inbound_mapping: indicate if the EPC device supports updating
* inbound mappings for an already configured BAR
* (i.e. allow calling pci_epc_set_bar() again
* without first calling pci_epc_clear_bar())
* @msi_capable: indicate if the endpoint function has MSI capability
* @msix_capable: indicate if the endpoint function has MSI-X capability
* @intx_capable: indicate if the endpoint can raise INTx interrupts
@ -231,6 +235,7 @@ struct pci_epc_bar_desc {
*/
struct pci_epc_features {
unsigned int linkup_notifier : 1;
unsigned int dynamic_inbound_mapping : 1;
unsigned int msi_capable : 1;
unsigned int msix_capable : 1;
unsigned int intx_capable : 1;